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The File Extension Library

What is a file extension?

Short answer: it's the set of letters after the period (.) in the name of a file.

Long answer: File extensions signify the file format of a file. It tells the operating system (OS) how data was stored in the file. Not all OS, require a file extension though. For instance, this is optional in Unix, but is mandatory with MS-DOS and Windows systems.

In most file formats the file type is actually defined by the contents (first bytes, file structure), but extensions are used to define the application that is used for opening the file.

Below is a detailed database of thousands of file extensions our team has compiled for you. Feel free to browse!


Browse all Extensions:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
SFX - Extension Details
Date Added: November 12, 2008
File Extension:  .SFX
Description 1: The .SFX extension refers to the Windows SelfExtracting Archive filetype. It is a compressed archive that may contain one or more files. SFX files run themselves upon opening, and extract and decompress the contents. In this way, users are able to access the archive minus the need for a file decompression utility. Create these files using WinAce SfxFactory, RARLAB WinRAR, ESTsoftALZip, Smart SFX Pro and WinZip.
File Type:   Compressed file
Mode: Binary
Program(s) to Open:  Windows: opens itself
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